Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means
Reexamination Certificate
2006-10-19
2010-10-12
Aurora, Reena (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
By magnetic means
C324S338000
Reexamination Certificate
active
07812610
ABSTRACT:
A wellbore tool for locating a target wellbore containing a conductive member from a second wellbore and directing the trajectory of the second wellbore relative to the target wellbore includes an electric current driver having an insulated gap; a three-axis magnetometer positioned within a non-magnetic housing that is disposed within a non-magnetic tubular, the three-axis magnetometer positioned below the electric current driver; a drill bit positioned below the three-axis magnetometer; a hollow tubular connected between the electric current driver and the three-axis magnetometer; and a measurement-while-drilling tool. The current driver generates an electric current across the gap to the portion of the tool below the insulated gap. In a method a current is generated across the insulated gap to the portion of the tool below the insulated gap to the conductive material in the target wellbore returning to a portion of the bottom hole assembly above the insulated gap thereby producing a target magnetic field. Measuring the target magnetic field at the bottom hole assembly and the earth's magnetic field; and determining the position of the second wellbore relative to the target wellbore. Then steering the bottom hole assembly to drill the second wellbore along a trajectory relative to the target wellbore.
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Clark Brian
Dupuis Christophe
Minerbo Gerald N.
Aurora Reena
Hofman Dave R.
Schlumberger Technology Corporation
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